Chemistry Lessons 44-52

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Across
  1. 4. substance with a pH less than seven
  2. 5. describes objects or substances that float in water
  3. 7. measure of the average kinetic energy of matter
  4. 10. temperature scale used in the United States
  5. 11. chemical reaction that gives off energy
  6. 12. new substance formed by a chemical reaction
  7. 15. instrument used to measure mass of matter
  8. 16. amount of matter a substance contains
  9. 18. occurs when a compound breaks down into two or more elements or simpler compounds
  10. 19. occurs when two or more elements or compounds that make a new compound
  11. 20. standard international measure of temperature
  12. 21. pH of pure water
Down
  1. 1. amount of space matter takes up
  2. 2. substance that is being changed
  3. 3. substance with a density of one
  4. 6. chemical reaction that occurs when an acid and a base react
  5. 8. chemical reaction that absorbs or gains energy
  6. 9. temperature used by scientists worldwide
  7. 13. occurs when an organic compound is heated and reacts with oxygen
  8. 14. substance with a pH greater than seven
  9. 17. measure of how tightly the atoms or molecules in matter are packed together